Re: comedi and interrupts

On Mon, 08.12.03, Frank Mori Hess <fmhess_at_users.sourceforge.net> wrote:

> Eww don't do that to the driver, or if you do it shouldn't be put into 
> comedi.  Either the hardware supports externally triggered scans or it 
> doesn't.  When someone sees that the driver claims to support externally 
> triggered scans, they aren't going to appreciate that it supports them 
> with an unreliable hack (and what you are describing will always be 
> unreliable).  Just like noone in the world understood that das-08 cards 
> didn't really support internally paced a/d conversions.

In that case i have to think of something else (probably buying different
hardware). And i thought this should be easy :)

But i wonder why exactly this can't be done. I thought that with an
RTAI realtime interrupt the latency should be deterministic. Is it just that
interrupt latency + runtime of my IRQ handler is too long?

thanks for your answers,

Nils

Received on 2003-12-09Z09:42:22